1913.] NATURAL SCIENCES OF PHILADELPHIA. 539 



preopercle edge bent well forward. Opercle deep, smooth. Top of 

 head with rather large fontanel extending from interorbital space 

 well back within occipital process. Last reaches nearl}- | to dorsal 

 origin. 



Gill-opening extends forward about opposite front eye edge. Rak- 

 ers about 8 + 12, slender, lanceolate, about f length of filaments, 

 and latter about I of eye. Isthmus narrowly constricted in front, 

 with slight median groove, and convex over surface behind. Branchi- 

 ostegals moderately long, subequal. 



Scales slightly ctenoid, small, moderately imbricated, disposed 

 in longitudinal series parallel with 1. 1., and of mostly uniform size. 

 Along predorsal ridge, on trunk along anal base, and on caudal base 

 scales all slightly smaller. A row of one or two small scales extends 

 basally along anal its entire length. Scales on breast large as those 

 on costal region. Each scale on body with several radiating striae. 

 Scales extend completely over body edges. Broad free axillary 

 pectoral scale, and pointed free axillary ventral scaly flap nearly 

 3 in fin. L. 1. complete, very slightly decurved so that largely 

 median, though extends a little low along side of caudal peduncle 

 to caudal base. Tubes simple, all well exposed, though not quite 

 reaching edges of scales. 



Dorsal origin about midway between mandible tip and hind edge 

 of adipose fin, first branched ray longest and a little longer than 

 head, and depressed fin reaches about f to adipose fin. Origin of 

 adipose fin near last third in space between origin of dorsal and 

 caudal base, fin about U in eye. Anal origin slightly before that 

 of dorsal, anterior rays a little higher than others, and edge of fin 

 nearly straight, its long base but slightly curved. Caudal moderate, 

 well forked, lobes pointed and lower slightly longer, both a little 

 longer than head. Pectoral low, upper rays longest, and depressed 

 tip falls slightly before dorsal origin. Ventral low, inserted nearly 

 midway between pectoral and dorsal origins and extends back beyond 

 front anal ray bases. Vent close in front of anal. 



Color in alcohol pale brownish almost everywhere, except on abdo- 

 men below and lower surface of head, dusted with minute dusky dots. 

 Edge of back and upper surface of head dusky. A narrow underlaid 

 silvery line or streak extends from shoulder to median caudal base, 

 and posteriorly in its course becoming plumbeous or leaden. Third 

 and fourth scales of I. I. crossed by deep dark blotch, above extending 

 well up above head in profile and below a little over half way towards 

 base of pectoral fin, so that it appears inchned forward. It is made 



